feat: redesign LoginScreen with icon, branding, polished layout

- Sports icon in primaryContainer circle (80dp)
- 'MyIce' branding (dropped 'K' tech codename)
- 'Votre calendrier hockey' subtitle
- Login icon on connect button
- Centered vertical layout with proper spacing

composeApp/src/commonMain/kotlin/ch/parano/myicek/ui/screens/LoginScreen.kt

@@ -17,14 +17,22 @@
 
 package ch.parano.myicek.ui.screens
 
+import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.Login
+import androidx.compose.material.icons.filled.SportsHockey
 import androidx.compose.material3.Button
 import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarHost
@@ -37,10 +45,12 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
-import ch.parano.myicek.viewmodel.AuthViewModel
+import ch.parano.myicek.ui.theme.Dimens
 import ch.parano.myicek.viewmodel.AuthState
+import ch.parano.myicek.viewmodel.AuthViewModel
 
 @Composable
 fun LoginScreen(
@@ -65,22 +75,44 @@ fun LoginScreen(
             horizontalAlignment = Alignment.CenterHorizontally,
             verticalArrangement = Arrangement.Center,
         ) {
+            Box(
+                modifier = Modifier
+                    .size(80.dp)
+                    .clip(CircleShape)
+                    .background(MaterialTheme.colorScheme.primaryContainer),
+                contentAlignment = Alignment.Center,
+            ) {
+                Icon(
+                    imageVector = Icons.Filled.SportsHockey,
+                    contentDescription = null,
+                    modifier = Modifier.size(48.dp),
+                    tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                )
+            }
+            Spacer(Modifier.height(Dimens.lg))
             Text(
-                text = "MyIceK",
+                text = "MyIce",
                 style = MaterialTheme.typography.headlineLarge,
                 fontWeight = FontWeight.Bold,
             )
             Text(
-                text = "Games",
+                text = "Votre calendrier hockey",
                 style = MaterialTheme.typography.titleMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
-            Spacer(modifier = Modifier.height(32.dp))
+            Spacer(Modifier.height(Dimens.xxl))
             if (state is AuthState.Loading) {
                 CircularProgressIndicator()
             } else {
                 Button(
                     onClick = { viewModel.login() },
+                    modifier = Modifier.height(48.dp),
                 ) {
+                    Icon(
+                        imageVector = Icons.AutoMirrored.Filled.Login,
+                        contentDescription = null,
+                    )
+                    Spacer(Modifier.size(Dimens.sm))
                     Text("Se connecter avec Infomaniak")
                 }
             }